The habitat and nature of early life

@article{Nisbet2001TheHA,
  title={The habitat and nature of early life},
  author={E. Nisbet and N. Sleep},
  journal={Nature},
  year={2001},
  volume={409},
  pages={1083-1091}
}
Earth is over 4,500 million years old. Massive bombardment of the planet took place for the first 500–700 million years, and the largest impacts would have been capable of sterilizing the planet. Probably until 4,000 million years ago or later, occasional impacts might have heated the ocean over 100 °C. Life on Earth dates from before about 3,800 million years ago, and is likely to have gone through one or more hot-ocean 'bottlenecks'. Only hyperthermophiles (organisms optimally living in water… Expand
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